Refractory stopper.



Pann'ud nt. 2341902...

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INVENzOR.

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WITNESSES,

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^ 4 UNITED STATES l PATENT OFFICE..

JonN n. ALLENDORFEE, onwEsTMoN'r, PENNSYLVANIA.

REFRAcToRY-STOPPER.

SPECIFICATION forming part of Letters vIatent No. 712,450, dated October 28, 1902. Application filed August 27,1902. Serial No. 121,197. (No model.)

.T @ZZ whom zit may concern:

" a resident of the borough of Westmont, in the county of Cambria and State of Pennsylvania, (whose post-office address is Johnstown,Penn sylvania,) have invented certain new and use ful Improvements in Refractory Stoppers; and I do hereby declare the followingto be a full, clear, and exact description of the inven-1 tion, such as will enable others skilled in the art to which it appertains to make and use the per-rod. The use of the metallic bolt in my SH'UIB.

In the manipulation of molten steel and other metals it is customary to employ ladles having a pouring-nozzle located in the bottomv thereof which is closed and opened by means of a refractory stopper secured to a stopperrod immersed in the molten metal which is contained in the ladle.`

The object of my invention is to provide a refractory stopper of an improved form of construction which is economical in manufacture and use, well adapted to the purposes intended, while at the same time so arranged as to provide better protection to the stopperrod and the means for securing the stopper thereon.

Certain previous styles of refractory stoppers have been secured to the stopper-rod by means of a bolt keyed thereto passing through a hole extending the entire length of the stopper, the lower portion of said hole being of enlarged diameter to admit the bolthead and the remainder of the opening after the insertion of said bolt has been plugged with refractory material. The result of this con/struction is that the plug of refractory material may become loose or broken on account of the severe use and heat to which it is subjected, which thus admits the molten metal to the key-bolt or the stopper-rod, with the result of heating or destroying them in such a way as tocause a failure of this important piece of apparatus, andfor these reasons a stopper made in the old manner, as above described, can only be used for about one, two, or three heats at the most. In my improved construction the bottom of the stopper is made solid and the entire stopper is firmly se- Y cured to the stopper-rod, thoroughlyinclosing Be itknown that I, JOHN H. ALLENDOREER, i

bedded therein, the projecting end of said bolt being provided with an external screw- Vthread which is screwed into a correspond- `ing threaded recess in the body of the stopimproved stopper provides a large bearinglsurface between the head thereof and the softer refractory material of the stopper for securing the same to the stopper-rod, thus adding to the strength and stiffness of the construction, and as the said'bolt is a simple machine-bolt it is easily and cheaply procured or manufactured.

My improved stopper may also be provided with a recess formed therein at its upper p0rtion, into which the main body of the stopper-rod is inserted, the refractory material surrounding said recess being so arranged as to form an external shoulder of less diameter than the body of the stopper, thus providing a seat and joint for the refractory sleeve, which in practice covers and protects the main body of the stopper-rod.

Having thus given a general description of my invention, its objects, and nature, I will now, in order to make it more clear, refer to the annexed sheet of drawings, which forms part of this specification, and in which like letters refer to like parts.

Figure l is a central vertical cross-sectional elevation of my improved stopper, and Fig.-

2 is a bottom plan view of the construction C is the body portion of the bolt, the upper end of which is threaded.

D is the bolt-head formed integral with the body portion, said bolt-head in this case being shown of hexagonal form, but may be either' square or other shape, if desired.

E is a projection or shoulder in the stopper, having the shape of a conical surface, as shown, to form a joint or seat in connection with the usual stopperrod sleeve. (Not shown.) i

F is a cylindrical recess on the top of the stopper, into which the end of the stopperrod B is inserted.

Having thus given a description of my invention, what I claim, and desire to secure by United States Letters Patent, is

l. A refractory stopper provided with a threaded metallic bolt the head and a portion of the body of which are embedded in said stopper, leaving the threaded end projecting therefrom, a stopper-rod having a threaded hole adapted to receive the threaded end of the bolt aforesaid, whereby said stopper is secured to said stopper-rod.

2. A refractory stopper provided with a threaded metallic bolt the head and a p0rtion of the body of which are embedded in said i stopper, leaving the threaded end projecting therefrom, an annular recess formed in the upper portion of said stopper around the projecting end of the bolt aforesaid, a stopperrod having,r a threaded hole arranged to receive the threaded end of said bolt, whereby said stopper is secured to said stopper-rod.

3. A refractory stopper provided with a threaded metallic bolt, the head and a p0rtion of the body of which are embedded in said stopper leaving the threaded end projecting therefrom, an annular recess formed in the upper portion of said stopper surrounding the projecting end of the bolt aforesaid, a shoulder formed on the upper portion of said stopper, a stopper-rod having a threaded hole arranged to receive the threaded end of the bolt aforesaid, whereby said stopper is sel cured to said stopper-rod.

4. A refractory stopper provided with a metallic holding-piece embedded therein, an

externally-threaded rod integrally connected therewith, and a stopper-rod having an internally-threaded hole to receive the projecting threaded end of said rst rod, whereby the stopper is secured to the stopper-rod.

In testimony whereof I hereto affix myfsignature in the presence of two witnesses.

JOHN H. ALLENDORFER;

Witnesses:

J. R. WEMLINGER, STONE EDELEN. 

